UPS Master Controller Noise-Resistant Voltage Command Generation
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Solution Overview
Problem
Existing uninterruptible power supply systems face instability due to noise interference in the transmission of gate pulses between the main control device and unit control devices, potentially leading to malfunction of power supply units.
Innovation Solution
A master controller generates common voltage command values for multiple uninterruptible power supply apparatuses, which include converters, inverters, and detection circuits, to ensure stable operation by transmitting these values to slave controllers for precise control, and includes error correction mechanisms to maintain stability even with communication noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the main control device transmits gate pulses to unit control devices, then the power supply units can be controlled, but noise may be superimposed on the gate pulses causing malfunction
Solution Approach 1:
The patent introduces an intermediary communication system between the main control device and unit control devices. Instead of directly transmitting gate pulses, the main control device sends control commands through a communication interface, and the unit control devices generate their own gate pulses based on received commands and local feedback. This intermediary layer isolates the control signal from noise interference in the power conversion path.
Solution Approach 2:
The control function is segmented into two parts: the main control device generates control commands and transmits them via communication interfaces, while the unit control devices locally generate gate pulses based on these commands and feedback signals. This segmentation separates the high-level control logic from the low-level pulse generation, allowing each to operate independently and reducing noise coupling.
2Measurement precision
If a highly functional CPU is provided in each power supply unit, then control precision can be improved, but cost increases
Solution Approach 1:
The control system is divided into a main control device that handles complex control algorithms and unit control devices that handle local execution. The main control device performs the computationally intensive tasks of generating voltage command values and calculating control signals, while unit control devices perform simpler tasks of generating gate pulses and providing feedback. This segmentation allows the use of less expensive microcontrollers in unit control devices while maintaining high control precision through the centralized main control device.
Solution Approach 2:
The system implements a feedback mechanism where unit control devices send detection values (such as output current and voltage information) back to the main control device. The main control device uses this feedback to adjust control commands and maintain precise control of the parallel-connected power supply units. This feedback loop compensates for the reduced computational capability of individual unit control devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows multiple uninterruptible power supply apparatuses to operate stably by reducing noise interference and quickly detecting and addressing communication errors, ensuring reliable power delivery to loads.
Implementation Method 1
a converter (4), which converts alternating-current (AC) power supplied from an AC power supply (100) to direct-current (DC) power
Implementation Method 2
an inverter (8), which converts DC power supplied from the converter (4) or a power storage device (B) to AC power
Data Source
AI summary
A master controller controls a plurality of uninterruptible power supply apparatuses each including a slave controller and detection circuits that detect at least a DC input voltage, an AC output voltage, and an output current of an inverter. The master controller generates a first voltage command value and a second voltage command value common to the plurality of uninterruptible power supply apparatuses based on detection values from the detection circuits transmitted from the slave controller of each of the uninterruptible power supply apparatuses. The master controller transmits the generated first and second voltage command values to the slave controller of each of the uninterruptible power supply apparatuses. The slave controller generates a first control signal for controlling a converter in accordance with the received first voltage command value. The slave controller generates a second control signal for controlling the inverter in accordance with the received second voltage command value.